| 基于双声光移频器的外差式激光多普勒测振计 |
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| 引用本文： | 尚建华,任立红,徐海芹,赵曙光,贺岩.基于双声光移频器的外差式激光多普勒测振计[J].光子学报,2012,41(10):1149-1155. |
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| 作者姓名： | 尚建华 任立红 徐海芹 赵曙光 贺岩 |
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| 作者单位： | 1. 东华大学信息科学与技术学院,上海,201620
2. 中国科学院上海光学精密机械研究所中国科学院空间激光通信及检验技术重点实验室,上海,201800 |
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| 基金项目： | 上海市教育委员会和上海市教育发展基金会“晨光计划”(No.11CG36)和中央高校基本科研业务费专项资金(No.12D10410)资助 |
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| 摘 要： | 分析了单声光移频器构成的外差式激光多普勒测振计中声光移频器驱动信号的频率稳定性和信号功率对待测振动信号的影响.为了降低声光移频器驱动信号频率漂移的影响,提出双声光移频器构成的外差式激光多普勒测振计,并基于直接数字频率合成技术,以相位噪音低、初始相位可控的芯片AD9912为核心器件,完成了声光移频器驱动信号生成及处理模块的设计.开展了双声光移频器组成的外差式激光多普勒测振计的振动测量实验,结果表明,驱动信号生成装置可以驱动声光移频器正常工作,且测振计的本底噪音在0～10kHz频带范围内呈现平坦分布,0～1kHz频段内噪音得到明显抑制,较单声光移频器构成的外差式激光多普勒测振计有显著改善.
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| 关 键 词： | 外差式激光多普勒测振计 声光移频器 直接数字频率合成 |
| 收稿时间： | 2012/5/16 |
Heterodyne Laser Doppler Vibrometer Based on Double Acousto-optic Frequency Shifters |
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| SHANG Jian-hua
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REN Li-hong
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XU Hai-qin
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ZHAO Shu-guang
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HE Yan.Heterodyne Laser Doppler Vibrometer Based on Double Acousto-optic Frequency Shifters[J].Acta Photonica Sinica,2012,41(10):1149-1155. |
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| Authors: | SHANG Jian-hua REN Li-hong XU Hai-qin ZHAO Shu-guang HE Yan |
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| Institution: | 1 College of Information Science & Technology,Donghua University,Shanghai 201620,China)(2 Key laboratory Space Laser Communication and Testing Technology,Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Shanghai 201800,China) |
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| Abstract: | The influence on the measured vibration signal caused by the frequency-stability and signal power of driver signal to acousto-optic frequency shifter (AOFS) in the high-precision heterodyne laser doppler vibrometry (HLDV) with one AOFSs was analyzed. In order to reduce the frequency drifting and the phase noise of the driver signal, the HLDV composed with two AOFSs was proposed. And based on the direct digital frequency synthesis (DDS) technology, the design of the driving signal generation unit has been completed with AD9912 which has the characteristic of adjustable initial-phase and low phase noise. The vibration-measuring experiments performed with HLDV consists of two AOFS shows that the designed generation unit is able to drive the AOFS. Meantime, compared with the HLDV with one AOFS, the noise floor from 0 to 10 kHz of the HLDV with two AOFS is flat and the noise distribution below 1 kHz has been depressed greatly. |
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| Keywords: | Heterodyne Laser Doppler Vibrometry (HLDV) Acousto-optic Frequency Shifter (AOFS) Direct Digital Frequency Synthesis (DDS) |
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